Wash one’s hands of the whole affair/matter

To disown or disassociate oneself from a particular state of affairs; the source is the New Testament, Matthew 27:24 when Pontius Pilate literally washed his hands of the condemnation of Jesus of Nazareth. “He took water and washed his hands before the multitude saying, ‘I am innocent of the blood of this just person: see ye to it.’”